1. thebordella

    thebordella New Member

    Messages:
    22
    Location:
    Ithaca, NY
    Hi all,

    In my previous post about a water supply line problem (resolved: http://www.terrylove.com/forums/showthread.php?t=32787) I attached some pictures (one also attached here). You can see here the remaining section of drain pipe left after I removed the old vanity.

    The reason this section of drain is remaining is because I don't know what I am doing. The old sink had old metal sections of pipe - both straight and curved - that eventually connected to a curved plastic section (almost like two P traps in sequence or something -- I don't know, but there was more than the one "curve" you see in a typical P trap diagram). I had no luck undoing the metal couplings so I simply cut right through a section of the plastic pipe. The remainder is what you see here. I decided at the time I would deal with this problem later.

    Well, it is now later!

    I've looked at diagrams of P traps. My first question is, why does the waste line in my picture curve pointed up? In all the diagrams I see for a P trap, the line curves down after the straight stub out from the wall. (As you can guess, I am not the original owner of this house, so I don't know why things are the way they are.)

    My intent is to put a new vanity in and hook up the sink. What do I need to do to get from what you see here to a typical P-trap to the sink? I'd like to use plastic wherever possible. Are there any approaches that don't involve solvents to join the sections? How do I unjoin the sections you see there now?

    thanks!
    -Aaron

    Attached Files:

  2. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,302
    Location:
    Yakima WA
    I would cut the elbow and coupler off, leaving just a stub sticking out. The P trap, sometimes called a "J" or "U" trap, comes down from the sink then curves back up toward the sink (like a "U" ), then turns 90 degrees and goes into that stub coming out of the wall. The actual connection to the drain requires a threaded adapter glued on the PVC pipe with a slip joint connector screwed to that. All of the connections from the sink to the drain are made with slip joints connections that are just hand tightened. The reason we cut that elbow off is connecting downward into that would create what is called an illegal S trap. That's a P trap with an extra curve. Any decent hardware store can assist you in getting the right parts for the p trap. They usually come as a packaged set of pieces with everything necessary.
  3. thebordella

    thebordella New Member

    Messages:
    22
    Location:
    Ithaca, NY
    Thank you, that helps!

    Just to clarify, you are saying to cut to the right (closer to the wall) of that white "collar" (coupler?) in the picture? This will leave a short stub but I suppose I can work with that.

    I will look for the P-trap kit you describe.

    -Aaron

  4. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,302
    Location:
    Yakima WA
    Yes, cut the couple and elbow off. You only need an inch or so to glue the threaded male adapter on the pipe.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,253
    Location:
    Cave Creek, Arizona
    drain

    If that elbow and coupling are glued on, then someone who also "did not know what he was doing", made a bad connection previously. I think you may have more problems with that broken hot water connection than with the drain. Another question. If you don't know what you are doing, WHY are you doing it?
  6. loafer

    loafer Mechanical Engineer

    Messages:
    49
    Location:
    Maine
    If everyone knew what they were doing, there would be no point to this forum.

  7. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    You had an S-trap which is illegal now in most cases.
    [​IMG]
  8. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,302
    Location:
    Yakima WA
    HJ questions whether the coupler is glued to the pipe stub coming out of the arm. I rarely disagree with HJ, he's most knowledgeable responder on this forum, but whether glues on not, that's the place to cut what you have to make a P trap. As I indicated before, you almost certainly had an S trap and that needs to change to a P trap. If you will refer to Florida Orange's diagrams, think of the 3/4 S trap that instead of pointing at 45 degrees down, it would come straight out and into the pipe in the wall. That would make it a P trap. There are other things that you need to know such as pipe size, P trap size what male adapter you need, but any good plumbing shop can assist you with that.
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